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김현식(Hyun-Sik Kim),이해연(Hae-Yeon Lee),김종령(Jong-Ryung Kim),오영우(Young-Woo Oh) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.3
We designed the flyback planar transformer, which had 8 W capacity, with 70 V input voltage and 8.2 V output voltage for the establishment of design method and the confirmation of application possibility. The numerical value of inductance measured under the switching frequency of 120 ㎑ was 1650 μH, which was the inductance efficiency of 85~87% against theoretical value. The A.C. resistance of primary and secondary coil was 4.2 Ω and 0.25 Ω respectively, On the other hand, the quality factor for each wound numbers showed quite a high value of 158 and 75 respectively. And the Coupling Factor was 0.96~0.97 under 120 ㎑ switching frequency. The inductance rapidly increased as the thickness of the core plane increased until it became 1.4 ㎜ but under the thickness more than 1.4 ㎜, there was no substantial change. Therefore, the critical value of the plane thickness of core was 1.4 ㎜. And the shape of the output wave of the planar transformer at 70V input voltage was a stable square wave.
김병걸(Byung-Geol Kim),송재성(Jae-Sung Song),김현식(Hyun-Sik Kim),오영우(Young-Woo Oh) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The magnetic properties of an Fe_(87)Zr_7B_5Ag₁(at.%) amorphous alloy have been investigated as a function of annealing temperatures to clarify its application potential as a core material for high-frequency use by adding a small amount of insoluble element of Ag. A new excellent soft magnetic material was developed. The amorphous alloy produced by relatively low temperature annealing at Tα=400℃ exhibited very high initial permeability (μi) of 288,000 at 1 ㎑ and 2mOe, very low coercivity (Hc) of 15mOe and low core loss (Wc) of 50 W/㎏ at 100㎑ and 1,000G which is comparable with Co-based amorphous alloys, respectively. It is notable that the values obtained in the present study are the best magnetic properties among various kinds of Fe-based soft amorphous materials reported up to date. The reasons for the achievement of good soft magnetic properties are presumably due to the homogeneous formation of very fine α-Fe clusters with the size of 2-3㎚ in an amorphous matrix, which can be deduced from the increase of resistivity and the TEM observation. The very fine α-Fe clusters embedded in an amorphous matrix had a great influence on reduction of magnetostriction and refinement of magnetic domain.